<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Document</title><script defer="defer" src="js/main.7ec9b55c68.js"></script></head><body><h1>hello lazy loading</h1><button id="btn">按钮</button></body></html>